I can understand how this might eventually become an issue, but this is less unlikely because of the nature of YC (people here are trying to represent themselve

I can understand how this might eventually become an issue, but this is less unlikely because of the nature of YC (people here are trying to represent themselves well to the yc 'crew', and to others who they might work with one day). The size of the community is small enough that it is difficult to hide in the crowd. If the community became much larger I think the most effective solution would be to require a minimum of X karma before you can submit. (To prevent 'gaming' you would have to couple this with preventing users with less than X karma from upvoting posts...) As it is I think a exponential delay before posting (they would sit in a publication queue) would be reasonable, but probably unneeded.